Blast-furnace.



JAMES SCOTT, OF PITTSBURG, PENNSYLVANIA.

BLAST-FURNACE.

Specification of Letters Patent.

Application filed May 3, 1910.

Patented July 19, 1910.

serial No. 559,098.

To all whom 'it may concern:

Be it vknown that'I, JAMES SCOTT, of Pittsburg, lin the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Blast-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to the construction of blast furnaces and more particularly relates to the construction of the upper end of the shaft of such furnaces.

One of the objects of my invention is to .provide a blast furnace having its upper part constructed without the usual refractory lining.- and having means by which abrasion of the inner metal surface is overcome and prevented.

It has been proposed to construct a blast furnace in which the refractory lining is dispensed with .in the upper part of the furnace shaft. `With such constructions as heretofore made the abrasion of the stock descending inthe furnace cuts away the metal lim-n to such an extentl that its use is practically prohibited on account of the short life of such metal shells.

Referring to theA drawings, Figure l is a sectional elevation showing the upper part of the shaft of a blast furnace. The bell, hopper and other top gear of the furnace, not forming part -of this invention, is omitted for the sake of clearness. Fig. 2 is a sectional detail on a larger scale showing the connection between the part of the furnace `shaft having a refractory lining andthe upper unlined portion in which a refractory lining is not employed.l Fig. 3 is a sectional detail on a larger scale show-v ing the annular rings on the furnace shell in the interior of the furnace located andarranged in accordance with my invention. Fig.'4 is a similar sectional detail showing a modified form` of ring construction. Fig. 5 is a sectional detail similar to Figs. 3 and 4 showing a further modification in the construction of the rings.

In the drawings, 2 represents the shaft of a blast furnace having a refractory lining 3 which extends upward-ly in the furnace to a. point above 'the furnace bosh and intermediate of the to and bottom lof the -furnace shaft. The s aft of the furnace above thev Ipart provided with the refractory lining .ps-shown as a built-up structure formed of heavy rolled metal plates which are securely riveted together. On the loutside of the shell formed by the plates is a series of annular water troughs 4, the outer surface of the metal shell 5 forming one side of these troughs.

'Secured on the interior of the unlined portion of the furnace shell and located at suitable intervals in the height thereof, is a series of rings 6. T hese rings are shown as encircling the interior of the furnace, although they niay not be continuous and may extend only partly around the furnace, when desired.

It is important that water in the troughs l is prevented from leakinginto the furnace and'for this reason the joints between the plates forming the shell are called and the bolts 7 which secure the rings 6 in place are screw threaded into the plates of the shell 5, with a locking nut 7? on their outer ends, and if desired, a gasket is placed between the adjoining surfaces of the plates and the nuts 7 L Water is supplied to the upper trough 4 and the water is led by the overflow pipe from the troughs into the next lower trough, nally reaching the water trough on the top of the lined shell portion of the furnace from which point it vis led through a suitable discharge pipe to a point of disposal.

In the operation of a blast furnace constructed in accordance with my invention, the furnace is charged, .the gases are led from the furnace 'throu h branche-s 8 con necting the furnaces with the downcomer aov and the furnace is tapped in the usual manner. The furnace is kept filled with burden Spaces between the rings 7 onthe interior of the furnace and the upper edges of the rings 7 will hold or maintain a thin annular layer of such materials in position. thin layer of stock kept in contact with the furnace shell formsa protecting wall,'the descending column of fuel in this wa being Arevented from contacting with an wearlng away the unlined plates of the furnace Theshall', and providing an elfeetive-i1'ieaiis for ,lengthening the life of such unl'ined shells.

ll`he advantages of my invention will he apparent lo those skilled in lhe arl. By the. use. olf the hallles on lhe inner surface. of the furnacel shell, lhe heretofore destructive. wear caused h v the eonsl'antly descending,- eolunrn eontaeling u'ilh the. surface, of the plates forming` the furnace shell is overcome and prevented. The use ol serew lhrealled holls with threaded openings in lhe furnaee shell maintains liglil' joinlsI and ell'eetivel)- prevents leakage el' the eoolin;J miler into lhe lurnaee l'l'irough lhe hell. hnles. ll`he ennsl'ruelion is simple and is easily liepl in repair.

Moffliliealiens in the eonelruelion and un rangenient oil' lhe. paris niniv be made wilhoul departing` lfroni iny invention. The waler lroughs ou lhe outside of lhe furnaee shell may be, dispensed willi, lhe shape, and lhe ninnlier ol.E lhe rings' may be varied, and other elianges nur;y be inade without departl, claim:

l. A blast 'furnace having a mel-allie shell, a portion thereof being unlined and means on the in'ner surface of said unlined shell portion arranged to act as ballles and retard lhe descent in the furnace of materials in Contact with the shell; substantially as described.

2. A blast furnace having a partly un lined niellallie shell, and a series of lu-ailles on lhe unlined inlerior nl: said shell adapted lo engage willi alnl relnlil lhe leseenlV olf ina lerials in said ful-muje.-ennlaeling \\'ilh lhe shell; sulislunlinll)I ar; fileserihell.

Il. A hlasl liurnaee havingr a nielallie shell, a relrueloir `lining, 'l'or parl ol lhe shell and a series ol' rings on lhe unl-ined inner surface of lhe. ,shell alluplell lo rel'ard lhe downward ninrenienl olf materialsl in eonl'uel willi lhe inner .s'lu'lizne olt 4Lhe shell; suhslnnliall)v as rlesei'ihell.

4.-. ln a hlasl' lfnrnaee a inelallie furnace shell` yaler troughs on lhe ouler surface ol.E said shell, a ring ou lhe. inner surlaee of the `shell and a pluraliliv o'l' lap bolts securing lhe ring' in plaee en ihe `shell7 said bolts beinge screw lhrealleil into lhe holt holes in the shell; suhslaulially described.

ln a blast fuenau-e '.1 nietallie furnace shell, waiter lroughs on the outer Surface of said shell. a series ojl.' separated rings on the inner surface of lheI shell and a plurality oi lap bells seeuringl the rings in place on the shell,` said bolts being screw threaded iulo the hell 'holes in the shell and rings; substantially as described.

In testimony whereof, I have hereunto seil my hand. 4

JAMES SCOTT. lVitnesses .J. P. COLLINS, GEORGE H. SMITH. 

